<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="lib/react.development.js"></script>
    <script src="lib/react-dom.development.js"></script>
    <script src="lib/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
</body>
<script type="text/babel">
    const root = ReactDOM.createRoot(document.querySelector("#root"));
    function App(){
        return (
            <div>
                <h3>App1</h3>
                <Child></Child>
            </div>
        )
    }
    function Child(){
        return (
            <div>
                <p>Child</p>
            </div>
        )
    }
    root.render(<App/>)
</script>
</html>